Latch



(Model.)

11. W. KAHLKB,

LATCH.

No. 461,200. mmm-,81001. 13, 1891.

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vUNITED .STATES HENRY Y. KAHLKE, OF

PATENT OFFICE.

BROOKLYN, NE V YORK.

LATCH.-

SPECIFICATION forming part of Letters Patent No. 461,200, dated October 13, 1,891. Application tiled March 23, 1891. Serial No. 385.996. (Model.)l

To all whom, it may concern:

Be it known that I, HENRY W. KAHLKE, a citizen of the United States, residing at Brooklyn,in the couutyof Kings and State of New York, have invented a new and useful Improvement in Night Latches and Locks, of which the following is a speciiication.

rlhe object of my present invention is to construct a night latch and lock that is not easy to pick and which.it would `be very difficult to make a skeleton k-ey for.

In carrying out my invention I employ a spindle that is grooved longitudinally upon opposite sides and has fiat sides intermediate to the grooves, and circular tumblers surround said spindle within a cylindrical case and are divided by helical springs. The cylindrical case is slotted longitudinally and in part circumferentially upon opposite sides,

and the key is of peculiar construction, being divided longitudinally into two prongs, with shoulders on each prong. Said keyis adapted to fit over or straddle the spindle and its prongs to enter both of the grooves of the spindle together and to act upon the tumblers in alternate sets upon both sides of the spindle simultaneously, moving the tumblers into line with the circumferential grooves, into which projections on the tumblers are turned by the partial rotation of the key and spindle in withdrawing the latch-bolt.

In the drawings, Figure l is an elevation of my latch, and Fig. 2 is a plan View of the same with the spindle-case in section. Fig. 3 is a sectional plan through the spindle-case and'tumblers. Fig. 4 is a cross-section at as ot Fig. 2. Fig. 5 shows the various tumblers in elevation, and Fig. G is an elevation ofthe key. A

@represents the latch-case, and a the latchbolt. These are to be of any well-known character, and do not require further descrip,- tion.

b represents the cylindrical key-tube, forming a lateral extension to the latch-case a, and b is an outer case surrounding thetube l) and removably attached by screws to the case a. The cylindrical key-spindle tube l) is slotted longitudinally on opposite sides at 1 2, and in part circumferentially at 3 4 and 5 6, and the end of the case b is flanged to retain the slotted washer 7.

c represents the spindle, longitudinally grooved on opposite sides at 8 9 and having fiat intermediate sides l0 11, and said spindle is central of the cases l) b,and the. circular tumblers e e c2 e3 surround said spindle Within the tube or case l), and said tumblers are separated and maintained in place toward the outer end of the tube b by helical springs. The tumblers e e c2 e3 are all circular and each provided with a central opening conforming to the spindle.v The tumblers e and eghave projections to enter the slot 2, and the tumblers e and e3 have projections to enter the slot Z of the tube l). The tumbler e has opposite projections to enter the spindlegrooves 8 9. The tumbler e has one projection to enter the groove 8, and the tumbler c3 has a notch for thekey-prong.

The key shown in Fig. G may be termed double-bitted, and consists of a handlef, a shank h, divided longitudinally to form the prongs il', and each prong is provided with shoulders or projections, as at l2 13, respectively. The central groove of the key which divides the shank is simply to straddle the spindle, and the shoulders or projections to edges of the prongs. 1 Vheu the` key is inserted to place, the prongs straddle the spindle and it the' grooves 8 9 thereof, the end of the prong t' and shoulder I2 coming against the tumblers e e3 on one side of the spindle and the end of the prong '1l' and shoulder 13 coming against the tumblers e c2. The tumblers are all moved simultaneously by the further movement of the key, and their projections are moved along the slots at l 2 until they come opposite the circumferential slots 3 4 and 5 6. At this point a epartial rotary movement of the key turns the spindle and tumblers and withdraws the latch-bolt c', the projections on the tumblers passing into the circumferential slots. Upon the release ot' the key the latch-spring turns the key back with the spindle to a normal position, and the springs between the tumblers return them to their position as in Fig. 2.

Any number of tumblers may be employed, ,and the prongs of the key may be of any desired length, with one or more shoulders on the outer edges of the prongs, without departing from the points oi' my invention.

operate the tumblers are all upon the outer- IOO calsprings; and akey divided longitudinally. v, intoprongsfwith shoulders, substantially as l18 set,4 forth.

3: The combination-,'with thelatC-h-caSe, ot aspindle grooved longitudinally onoppositeV sides: and. having flatA intermediate sides,` a:

spindle-tube, slotted longitudinally and in 'part cii'cumferentially on oppositezA sides, an

external removable case b', slotted disk 7, circular .tunlblers having projections and arranged in alternate pairs with their projections moving in the slots of the tube, intermediate helical springs, and a key divided longitudinally into prongs with shoulders,

substantially as set forth.

4. The combination, in a latch or lock, with the -tumblers, of a spindle grooved longitudinally on opposite sides, and a key divided `longitudinally into prongs adapted to stradd'l'ethespindle and"v enter its grooves to turn kthe same and the tumblers, substantially as set forth.

Signedy by me this'rlSthday of'MarchVAiD. 91;

. HENRY W. KASHLKE;

lVitnesses:

GEO.A T. PINcKNEY-l, WILLIAM G. MoTT. 

